Bit-brace



J. S. FRAY.-

BIT BRAGE.

(No Model.)

No. 304,519. Patente-d sept. 2, 1884.

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' NITED STATES PATENT nnrcn JOHN S. FRAY, OF BRIDGEPOBT, CONNECTICUT.

BIT- B RACE.

SPECIFICATION forming part of Letters Patent No. 304,519, datedSeptember 2, 1884.

Application filed June 2, 1884, (No model.)

To all whom it 17mg/ concern:

Beit known thatI, JOHN S. FRAY, a citizen of the United States,residing'at Bridgeport, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements inBit-Braces or Chucks; and I do hereby declare that the following isafull, clear, and exact description of the same, reference being hadto"the annexed drawings, making a part of this specification, and to theletters and gures of reference marked thereon.

Figure l of the drawings is a sectional elevation of my invention, andFig. 2 detail views of the several parts constituting my inventiondetached from each other.

The present invention has for its object to provide simple and effectivemeans for both opening and forcing outward the gripping- 2o jaws of abit-brace or other chuck as the usual sleeve is turned in the properdirection to liberate said jaws, which objects I attain by theconstruction substantially as shown in the drawings, and hereinafterdescribed and claimed.

In the accompanying drawings, A represents a central rod formed with asocket, a, slotted longitudinally and screw-threaded to receive ascrew-threaded sleeve, B. t

The form and construction of the several parts above described do notdiffer from those ordinarily in use, and therefore further descriptionof them is deemed unnecessary.

The gripping-jaws C are provided with angular arms b, which are pivotedto a frame, D, or short arms cast with a tube or cylinder, E, in whichis located a pin or piston, F, having a at head to bear on the upperside of the arms of the gripping-jaws. rIhis tube or cylinder E iitsloosely in the socket ct, and around the pin or piston F passes a spiralspring, c, of sufficient length to extend up into the socket and bearagainst the extremity thereof. As will be noticed, the arms b of thejaws do not cross each other, but are shortened, so as to pass eachother at the axial center of the tube, while the head of the pin orpiston F, being at as it is forced outward by the spring o against thearms, the action will be to push outward and at the same time open thejaws as soon as liberated by unscrewing or otherwise freeing the sleeveB from its action on said jaws.

The means of both opening outwardly and I from each other of thegripping-j aws are equally applicable to all kinds of chucks as well asbit-braces, drills, and other like tools provided with movablegripping-jaws. The actionrof the sleeve B, when brought down` againstthe jaws C, will be to close them onto the bit-shank and hold it iirmlyin the usual manner, and when it is desired to remove the .Having nowfully described my invention,

what I claim as new, and desire to secure by Letters Patent, isv I. Abit-brace or other chuck having suitable gripping-jaws, and at theirupper ends, at an angle thereto, a frame or two short arms cast with atube or cylinder having a springencircled pin or piston, which serves toexpand the jaws,l substantially as described.

2. A bit-brace or other chuck having suitable gripping-jaws provided attheir upper ends, and at anangle thereto, with a frame or two short armssecured to or made integral therewith, a tube or cylinder having a pinor piston located therein, and which is encircled by a suitable springbearing against a Harige on the lower end of said pin or piston, and itsopposite end located in the cylindrical head, all of which serve toexpand the jaws when the sleeve is turned back, substantially asdescribed. v

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

JOHN S. FRAY.

Vitnesses:

Josnrrr T. FRAY, Jas. B. IionnnLr..

